Global Patent Index - EP 0389297 A1

EP 0389297 A1 19900926 - A spin glass magnetic body, a magnetic recording medium and a magnetic recording apparatus.

Title (en)

A spin glass magnetic body, a magnetic recording medium and a magnetic recording apparatus.

Title (de)

Ein magnetischer Spin-Glas-Körper, ein magnetischer Aufnahmeträger und ein magnetisches Aufnahmegerät.

Title (fr)

Corps magnétique ayant un verre avec spin, support d'enregistrement magnétique et appareil d'enregistrement magnétique.

Publication

EP 0389297 A1 19900926 (EN)

Application

EP 90303138 A 19900323

Priority

  • JP 7230289 A 19890324
  • JP 21142289 A 19890818

Abstract (en)

A magnetic recording medium (1) is prepared using a spin glass magnetic body of a thin film of a ferrite composition as a recording layer (3). The value of the magnetization of this layer (3) varies according to the magnitude of the magnetic field applied when it is cooled from a temperature above the spin freezing temperature of the spin glass magnetic body of it, and information can therefore be recorded or erased by using this property.

IPC 1-7

H01F 1/153

IPC 8 full level

G11B 5/00 (2006.01); G11B 5/64 (2006.01); G11B 11/105 (2006.01); H01F 10/187 (2006.01)

CPC (source: EP US)

G11B 5/00 (2013.01 - EP); G11B 5/658 (2021.05 - EP US); G11B 11/10508 (2013.01 - EP); G11B 11/10586 (2013.01 - EP); H01F 10/187 (2013.01 - EP); G11B 2005/0005 (2013.01 - EP); G11B 2005/0021 (2013.01 - EP)

Citation (search report)

  • [A] JP S63117357 A 19880521 - PIONEER ELECTRONIC CORP
  • [AP] WO 8906038 A1 19890629 - SIEMENS AG [DE]
  • JOURNAL OF PHYSICS. F: MET. PHYS, vol. 16, 1986, great Britain, N. SAITO et al. "Micto- magnestism of Fe-rich Fe-Zr amorphons alloys studied by AC susceptibility in a superposed DC field, pages 311-919
  • JOURNAL OF APPLIED PHYSICS, vol. 52, no. 3, part III, March 1981, New York A. BERTON et al. "Remanent magnetization and thermal relaxation in a frustrated spin-glass : Eu1 - xGdxS " pages 1763 -1765
  • JOURNAL OF PHYSICS. F, METAL PHYSICS, vol. 11, no. 10, 1981, Great Britain BIV.B. SARKISSIAN "The appearance of critical behaviour at the onset of ferromagnetism in AuFe alloys" pages 2191-2208
  • JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, vol. 31-34, part III, 1983, Evanston, USA K. KATSUMATA "Experiments on randomly mixed magnets with competing interactions" pages 1435-1438
  • JOURNAL DE PHYSIQUE, vol. 46, no. 2, February 1985, GrenobleCedex, France B. DIENY, B. BARBARA "Random anisokopy effects on the phase transition of amorphous DyxGd1-xNi" pages 293-302
  • JOURNAL DE PHYSIQUE, vol. 49, no. 12, December 1988, Japan T. SAITO et al. "Magnetic properties of amorphous DyxFe1-x thin films" pages C8-1235-C8-1236

Designated contracting state (EPC)

DE FR GB

DOCDB simple family (publication)

EP 0389297 A1 19900926; EP 0389297 B1 19941123; DE 69014224 D1 19950105; DE 69014224 T2 19950511

DOCDB simple family (application)

EP 90303138 A 19900323; DE 69014224 T 19900323